Rev 1.6

vicorpower.com

Page 11 of 42

11/2015

800 927.9474

PRM48BH480x250A00

Signal Specifications (cont.)

TRIM (Adaptive Loop Operation Only)

• Provides dynamic trim control over the PRM output voltage in Adaptive Loop Operation

• Sampled prior to every start up to detect if trim is active or inactive

• Output voltage is equal to 20 times the voltage at the TRIM pin when applied TRIM voltage is within the active range

• Trim state is detected during normal operation and cannot be changed until start up is initiated

Signal Type

State

Attribute

Symbol

Conditions / Notes

Min

Typ

Max

Unit

Trim Enable Threshold

Pull below this value during

3.10

V

start up to enable trim control

Trim Disable Threshold

Pull above this value during

start up to disable trim control

3.20

V

Start up

Minimum Trim Disable

Minimum TRIM resistance required

10

M

Ω

Resistance

to disable trim

Trim Capacitance

100

pF

(External)

Trim Sample Delay

From ENABLE high to TRIM sampled

100

140

200

µs

Analog Input

TRIM Pin

See Figure 26

1.00

2.75

V

Analog Range

TRIM Gain

20

V / V

Normal

Trim Accuracy

Vout accuracy, exclusive of

Operation

external resistor tolerance

0.5

2.0

%

200

mV

Trim Resolution

Trim Latency

60

120

240

µs

Trim Bandwidth

-3dB point

1.2

kHz